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Messages - JulianS

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Twins / Re: A 10 Gearbox sprocket oil seal.
« on: 10 January, 2018, 19:24:47 »

The new seals can be hard to seat correctly, they are usually just a fraction larger diameter and a fraction thicker than the originals which makes it difficult to get them right against the bearing and to get the circlip back into its groove.

Check seal is fully in the recess and against the bearing and that the circlip is fully in its groove.

The Star and Garter / Re: How many bikes built.
« on: 09 January, 2018, 19:41:49 »
Around 60000.

Standard models went up to about frame number 51200.

C15G went up to about 2400.

C15S to about 4000.

Then smaller numbers of of the more specialised models.

Twins / Re: Rocker Inspection Nuts
« on: 09 January, 2018, 18:21:50 »
The original nuts used by the factory on the GA7 frame number bikes 1960  were a reduced hex plain nut, part 01 6032, which took a 2BA spanner. The top stud on the inlet cover was different from the other 7, with flats machined to allow use of spanner to remove it,  giving better clearance when removing/refitting the A10 rocker box.

I dont think there is enough clearance on the cover recesses to fit a full hex nut.

Twins / Re: TLS diagram
« on: 08 January, 2018, 20:39:47 »
I presume you fitted the spacer behind the bearing?

Twins / Re: TLS diagram
« on: 08 January, 2018, 18:43:23 »
Diagram from A65 workshop manual. Are you looking for anything in particular?

Singles / Re: C12 seat
« on: 08 January, 2018, 11:18:23 »
I think it was unique to the C12.

The best seats, not cheap ones, come from R K Leighton, worth phoning them to enquire.

Twins / Re: A65 OIF remote oil filter.
« on: 07 January, 2018, 10:10:04 »

Singles / Re: Oil feed/return pipes
« on: 07 January, 2018, 09:56:02 »
The armoured pipes fit swinging arm models only. The plungers used rubber pipes joining the brass pipes at either end. Parts 17 and 26 on the below photo from parts book.

Twins / Re: a65 oil pressure
« on: 06 January, 2018, 14:18:07 »
PRV stamped 70 likely from a Rocket 3.

Twins / Re: a65 oil pressure
« on: 06 January, 2018, 12:36:59 »
Was the oil leak present before the fitting of the oil pressure gauge? Where is it plumbed into the system?

Twins / Re: a65 oil pressure
« on: 06 January, 2018, 11:28:45 »
From the parts books the OIF A65 was fitted with PRV part 71 2370 which is the same as fitted to the later OIF B25 after XE 2578 and was rated at 75 psi.

The 1970 A65 shown as part 71 1327 rated at 50 psi, the difference being the spring.

Twins / Re: A10 Pistons again
« on: 05 January, 2018, 09:48:44 »
Photo showing original Hepolite ring set packing

Twins / Re: A10 Pistons again
« on: 05 January, 2018, 09:13:38 »
The original Hepolite also came in yellow boxes ...................

You still sometimes see new old stock Hepolite pistons and rings offered.

Twins / Re: A10 Pistons again
« on: 04 January, 2018, 17:26:28 »
I doubt 5 grams per piston will have a significant effect on engine balance, your existing pistons may not be original BSA and if they are the old British Hepolite (not to be confused with new hepolite) then these were somewhat more sturdy in construction and heavier than the original BSA.

I have used the new hepolite, pistons seemed OK but new hepolite rings poor quality mine failed to bed in after just over 1000 miles when I gave up with them and after having the cylinders honed fitted Italian GPM which soon bedded in.

If linering the barrel in my view the lipped at the top liners make a better job than the unlipped. Others may disagree.

Linering can be an expensive job.

Twins / Re: A65 problems
« on: 03 January, 2018, 18:21:01 »
You need to replace the crankcase because of the broken fixing.

Something does not look right with the cam followers, one obviously missing the others look marked though the photo not is not very  clear.

I recommend a complete stripdown to see exactly what you have and what you need to do. Going by the photos posted expect to find other issues and to spend lots.

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